$35.$ Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes ea cart with the same force for $5$ s$.$ If the kinetic energy of the lighter cart after the push is K$,$ the kinetic energy the heavier cart is a$)$

b$)$

K$/4$

K$/2$

c$)$

K$.$

d$)$

$2$K$.$

e$)$

$4$K$.$